Model Analysis of Time Reversal Symmetry Test in the Caltech Fe-57 Gamma-Transition Experiment

The CALTECH gamma-transition experiment testing time reversal symmetry via the E2/M1 mulipole mixing ratio of the 122 keV gamma-line in Fe-57 has already been performed in 1977. Extending an earlier analysis in terms of an effective one-body potential, this experiment is now analyzed in terms of effective one boson exchange T-odd P-even nucleon nucleon potentials. Within the model space considered for the Fe-57 nucleus no contribution from isovector rho-type exchange is possible. The bound on the coupling strength phi_A from effective short range axial-vector type exchange induced by the experimental bound on sin(eta) leads to phi_A < 10^{-2}.Comment: 5 pages, RevTex 3.

Applications and efficiencies of the first cat 63K DNA array

The development of high throughput SNP genotyping technologies has improved the genetic dissection of simple and complex traits in many species including cats. The properties of feline 62,897 SNPs Illumina Infinium iSelect DNA array are described using a dataset of over 2,000 feline samples, the most extensive to date, representing 41 cat breeds, a random bred population, and four wild felid species. Accuracy and efficiency of the array\u2019s genotypes and its utility in performing population-based analyses were evaluated. Average marker distance across the array was 37,741 Kb, and across the dataset, only 1% (625) of the markers exhibited poor genotyping and only 0.35% (221) showed Mendelian errors. Marker polymorphism varied across cat breeds and the average minor allele frequency (MAF) of all markers across domestic cats was 0.21. Population structure analysis confirmed a Western to Eastern structural continuum of cat breeds. Genome-wide linkage disequilibrium ranged from 50\u20131,500 Kb for domestic cats and 750 Kb for European wildcats (Felis silvestris silvestris). Array use in trait association mapping was investigated under different modes of inheritance, selection and population sizes. The efficient array design and cat genotype dataset continues to advance the understanding of cat breeds and will support monogenic health studies across feline breeds and populations

PARITY VIOLATION IN 239U NEUTRON RESONANCES

La non conservation de la parité à été étudiée dans le 239U en mesurant la dépendance de la section efficace, résonante dans l'onde P, en fonction de l'hélicité de neutrons épithermiques diffusés par 238U. Une approche statistique donne l'écart type M=0.58+0.50-0.25meV pour l'élément de matrice violant la parité dans le mélange des ondes S et P. Ceci correspond à TPV=1.0x10-7eV. On déduit de cette largeur la valeur αp=4x10-7 du rapport de l'intensité ne conservant pas à celle conservant la parité dans l'interaction effective NN.Parity nonconservation was studied in 239U by measuring the helicity dependence of the p-wave resonance cross section for epithermal neutrons scattered from 238U. A statistical approach was used to determine the root-mean-squared parity-violating matrix element for the mixing of p-wave and s-wave states to be M=0.58+0.50-0.25 meV. This corresponds to a parity-violating spreading width of TPV=1.0·10-7 eV. This spreading width gives a value of 4. 10-7 for αp, the ratio of strengths of the parity-nonconserving and parity-conserving effective nucleon-nucleon interactions

Multi-view Active Appearance Models for the X-Ray Based Analysis of Avian Bipedal Locomotion

Abstract. Many fields of research in biology, motion science and robotics depend on the understanding of animal locomotion. Therefore, numerous experiments are performed using high-speed biplanar x-ray acquisition systems which record sequences of walking animals. Until now, the evalu-ation of these sequences is a very time-consuming task, as human experts have to manually annotate anatomical landmarks in the images. There-fore, an automation of this task at a minimum level of user interaction is worthwhile. However, many difficulties in the data—such as x-ray occlu-sions or anatomical ambiguities—drastically complicate this problem and require the use of global models. Active Appearance Models (AAMs) are known to be capable of dealing with occlusions, but have problems with ambiguities. We therefore analyze the application of multi-view AAMs in the scenario stated above and show that they can effectively han-dle uncertainties which can not be dealt with using single-view models. Furthermore, preliminary studies on the tracking performance of huma